Former vice presidential candidate Joe Lieberman said he hopes Alexandria Ocasio-Cortez is “not the future” of the party — prompting the Democratic progressive darling to slap back, “New party, who dis?”

Lieberman, a former Democrat-turned-independent senator from Connecticut, shared his thoughts about Congress’ progressive new member in an interview with Fox Business on Thursday night.

“With all respect, I certainly hope she’s not the future and I don’t believe she is,” said Lieberman, who was the Democratic party’s vice presidential nominee in the 2000 election.

Ocasio-Cortez, 29, fired off a response to her 2.3 million followers on Twitter: “New party, who dis?” with a link to the 76-year-old’s comments.